Leonardo
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 Apr10 comment How can I determine the values of a third point to make all 3 collinear in $\mathbb{R}^3$ Thanks, I did add the point and was checking it but with no clue what I was doing, but I can figure out why it works soon thanks to your explanation and example. Thank you! Apr10 comment How can I determine the values of a third point to make all 3 collinear in $\mathbb{R}^3$ I think this is a good answer, but I am lacking so much basic knowledge that it is hard to understand exactly what I am doing. My instinct tells me based on what you say that $3 + t(-2) = 2$ so $t = 1/2$ and $(1/2, 1, -1)$ satisfies the equation? Apr10 asked How can I determine the values of a third point to make all 3 collinear in $\mathbb{R}^3$ Apr7 accepted What does it mean to be proportional to something? Apr7 comment What does it mean to be proportional to something? Hm that is interesting, and it confirms my answer when I use the k, that really helps too. It is truly discomforting that my brain does all that without informing me how it was done.. Many thanks! Apr7 asked What does it mean to be proportional to something? Apr6 accepted Find all values of $a$ such that $w = ai- \frac{a}{3}j$ is a unit vector Apr6 comment Find all values of $a$ such that $w = ai- \frac{a}{3}j$ is a unit vector Thanks a lot, that problem has been bothering me but no longer! Apr6 awarded Critic Apr6 comment Find all values of $a$ such that $w = ai- \frac{a}{3}j$ is a unit vector So that would lead me to $a = +\sqrt{\frac{9}{10}}$ and $a = -\sqrt{\frac{9}{10}}$. Does that sound correct? Apr6 revised Find all values of $a$ such that $w = ai- \frac{a}{3}j$ is a unit vector added 57 characters in body Apr6 asked Find all values of $a$ such that $w = ai- \frac{a}{3}j$ is a unit vector Apr6 accepted Solve binomial expression with a variable under a square root? Apr6 asked Solve binomial expression with a variable under a square root? Mar12 accepted How might one go about proving this poorly worded theorem about divisibility with the number 3? Mar12 comment How might one go about proving this poorly worded theorem about divisibility with the number 3? The contrast in the clarity between my claim and your theorem is palpable, well done sir. Mar12 revised How might one go about proving this poorly worded theorem about divisibility with the number 3? added 35 characters in body Mar12 asked How might one go about proving this poorly worded theorem about divisibility with the number 3? Mar1 accepted Is this a correct proof for this relation? Feb27 accepted Can we have a matrix whose elements are other matrices as well as other things similar to sets?